How much lift do you want?
The 3" Duff lift is really hard to beat for the price and it's really good quality stuff. You probably do need a drop pitman arm for it though. Blocks or add-a-leafs are fine in the rear, you can always get new springs in the future... just don't go crazy with blocks... about 4" is the most I would ever run... and don't ever stack them.
The progressive rate coils and matched 70/30 shocks provide a higher quality ride, improved handling and between 2.5-3″ lift (depending on vehicle), giving clearance for larger tires.
dufftuff.com
If you need 5-6" then I would suggest the more expensive Duff lift first, and Skyjacker second.